WO2010143683A1 - Plaque réfléchissant le rayonnement infrarouge et feuille de verre liée réfléchissant le rayonnement infrarouge - Google Patents

Plaque réfléchissant le rayonnement infrarouge et feuille de verre liée réfléchissant le rayonnement infrarouge Download PDF

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WO2010143683A1
WO2010143683A1 PCT/JP2010/059830 JP2010059830W WO2010143683A1 WO 2010143683 A1 WO2010143683 A1 WO 2010143683A1 JP 2010059830 W JP2010059830 W JP 2010059830W WO 2010143683 A1 WO2010143683 A1 WO 2010143683A1
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Prior art keywords
light
light reflecting
liquid crystal
layer
layers
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English (en)
Japanese (ja)
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和宏 沖
市橋　光芳
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Fujifilm Corp
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Fujifilm Corp
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Priority to US13/377,571 priority Critical patent/US20120086904A1/en
Priority to CN201080025374.9A priority patent/CN102804003B/zh
Priority to EP10786214A priority patent/EP2442161A4/fr
Publication of WO2010143683A1 publication Critical patent/WO2010143683A1/fr
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10036—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10431—Specific parts for the modulation of light incorporated into the laminated safety glass or glazing
    • B32B17/1044—Invariable transmission
    • B32B17/10458—Polarization selective transmission
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
    • B32B17/10678—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer comprising UV absorbers or stabilizers, e.g. antioxidants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
    • B32B17/10761—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing vinyl acetal
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3016—Polarising elements involving passive liquid crystal elements

Definitions

  • the present invention relates to an infrared light reflection plate having a plurality of light reflection layers formed by fixing a cholesteric liquid crystal phase, and mainly relates to an infrared light reflection plate used for heat insulation of windows of buildings and vehicles.
  • the present invention also relates to an infrared light reflective laminated glass using the infrared light reflection plate.
  • the special metal film can be manufactured by laminating a plurality of layers by, for example, the vacuum film forming method disclosed in Patent Document 1. Although these special metal film coatings produced by vacuum film formation have excellent reflection performance, the vacuum process has low productivity and high production cost.
  • Patent Document 2 proposes a heat ray reflective transparent substrate having a layer containing metal fine particles.
  • Patent Document 3 discloses a heat ray blocking sheet having a layer containing an infrared absorbing dye. When an infrared absorbing dye is used, the solar transmittance can be lowered, but there is a problem that the heat shielding performance is lowered due to an increase in film surface temperature due to the absorption of solar radiation and the re-release of the heat.
  • Patent Document 4 discloses a laminated optical film having a retardation film having a predetermined characteristic and a reflective circularly polarizing plate and having reflectivity for infrared rays, and a cholesteric liquid crystal phase is used as the retardation film.
  • An example is disclosed.
  • Patent Document 5 discloses an infrared light reflective article including a visible light transmissive substrate and an infrared light reflective cholesteric liquid crystal layer.
  • Patent Document 6 discloses a polarizing element having a plurality of cholesteric liquid crystal layers, but such a laminate formed by laminating cholesteric liquid crystal layers mainly includes light in the visible light region. Is used for the purpose of efficiently reflecting light.
  • JP-A-6-263486 Japanese Patent Laid-Open No. 2002-131553 JP-A-6-194517 Japanese Patent No. 4109914 Special table 2009-514022 Japanese Patent No. 3500127
  • the ⁇ / 2 plate is a special retardation plate, and its production is difficult and the production cost increases. Further, the material is limited to a special one, and as a result, the application may be limited. Further, the ⁇ / 2 plate usually acts as a ⁇ / 2 plate for light incident from the normal direction with respect to the layer surface, but strictly speaking, for light incident obliquely, ⁇ / Does not function as two plates. For this reason, the configuration in which the ⁇ / 2 plates are combined has a problem that light incident from an oblique direction cannot be completely reflected.
  • an object of the present invention is to improve the reflection characteristics of an infrared light reflection plate having a plurality of light reflection layers formed by fixing a cholesteric liquid crystal phase without requiring the use of a ⁇ / 2 plate. More specifically, the present invention provides a selective reflection characteristic for broadband light, which is a combination of an inexpensive substrate with in-plane retardation variation and a plurality of light reflecting layers in which a cholesteric liquid crystal phase is fixed. It is an object to provide an excellent infrared light reflecting plate and infrared light reflecting laminated glass.
  • the present inventors diligently studied. As a result, the cholesteric liquid crystal phase having selective reflection characteristics with respect to light in the same wavelength region and having opposite optical rotation (ie right or left optical rotation) is fixed. It was found that if the light reflecting layer is arranged on the substrate adjacent to each other, it is possible to reflect both the left circularly polarized light and the right circularly polarized light in the wavelength range without being affected by the optical characteristics of the substrate. By further forming a pair of light reflecting layers having selective reflection characteristics for light in other wavelength ranges and fixing cholesteric liquid crystal phases having opposite optical rotations (that is, right or left optical rotation). It was also found that the characteristics could be broadened.
  • the reflection center wavelengths of the light reflection layers X1 and X2 are ⁇ X1 (nm), which are equal to each other and reflect circularly polarized light in opposite directions,
  • the reflection center wavelengths of the light reflection layers Y1 and Y2 are ⁇ Y1 (nm), which are equal to each other and reflect circularly polarized light in opposite directions, ⁇ X1 and ⁇ Y1 are not equal, and the refractive index anisotropy ⁇ n X1 and ⁇ n X2 of the light reflecting layers X1 and X2 satisfy ⁇ n X2 ⁇ n X1 , respectively, and the refractive index of each of the light reflecting layers Y1 and Y2 Anisotropy ⁇ n Y1 and ⁇ n
  • An infrared light reflector that reflects infrared rays having a wavelength of 700 nm or more.
  • the reflection center wavelength ⁇ X1 (nm) of the light reflection layers X1 and X2 is in the range of 900 to 1050 nm
  • the reflection center wavelength ⁇ Y1 (nm) of the light reflection layers Y1 and Y2 is in the range of 1050 to 1300 nm.
  • the light reflecting layers X2 and Y2 are layers formed by fixing the cholesteric liquid crystal phase using the liquid crystal composition applied to the respective surfaces of the light reflecting layers X1 and Y1 as the cholesteric liquid crystal phase.
  • the infrared light reflector according to any one of [1] to [3].
  • Two light reflection layers X3 and X4 each having a cholesteric liquid crystal phase fixed on the light reflection layer X2, and two light beams having a cholesteric liquid crystal phase fixed on the light reflection layer Y2.
  • the reflection center wavelengths of the light reflection layers X3 and X4 are ⁇ X3 (nm), which are equal to each other and reflect circularly polarized light in opposite directions, Mutually equal a light reflective layer Y3 and Y4 each reflection center wavelength is the wavelength lambda Y3 (nm), and reflects the different direction of the circularly polarized light from each other, and, ⁇ X3 and ⁇ Y3 are not equal to each other and ⁇ X1 and ⁇ Y1 are not equal to each other,
  • the infrared light reflector according to any one of [1] to [5].
  • An infrared light reflective laminated glass having two glass plates and an infrared light reflection plate of any one of [1] to [9] between them.
  • the reflection characteristics can be improved without requiring the use of a ⁇ / 2 plate.
  • a reflection characteristic for broadband light comprising a combination of an inexpensive substrate with in-plane retardation variation and a plurality of light reflecting layers in which a cholesteric liquid crystal phase is fixed. It is possible to provide an infrared light reflector and an infrared light reflective laminated glass using the same.
  • the refractive index anisotropy ⁇ n of a layer formed by fixing a cholesteric liquid crystal phase is defined as follows.
  • the refractive index anisotropy ⁇ n of a layer formed by fixing a cholesteric liquid crystal phase means ⁇ n at a wavelength exhibiting selective reflection characteristics (specifically, near a wavelength of 1000 nm).
  • a layer on which a cholesteric liquid crystal phase in which the helical axis is uniformly oriented with respect to the film surface is fixed is formed on a substrate (glass, film) subjected to orientation treatment or provided with an orientation film.
  • the selective reflection of the layer is measured, and the peak width Hw is obtained.
  • the spiral pitch p of the sample is separately measured.
  • the helical pitch can be measured by observing a cross-section TEM.
  • the reflection center wavelengths are equal to each other of each layer, it is a matter of course that an error generally allowed in the technical field to which the present invention belongs is also considered. In general, the reflection center wavelength will be regarded as the same even if there is a difference of about ⁇ 30 nm.
  • the infrared light reflector shown in FIG. 1 has light reflecting layers 14a and 14b formed by fixing a cholesteric liquid crystal phase on one surface of a substrate 12, and the cholesteric liquid crystal phase is fixed on the other surface of the substrate 12.
  • the light reflecting layers 16a and 16b are formed.
  • the substrate 12 is, for example, a polymer film, and there is no particular limitation on the optical characteristics thereof.
  • a member having a variation in the in-plane retardation Re is used as a substrate.
  • ⁇ / 2 is used as a substrate, and its optical characteristics are improved in light reflection characteristics. It is distinguished from the prior art that is actively used. However, as a matter of course, it does not preclude the use of a retardation plate whose phase difference is accurately adjusted, such as a ⁇ / 2 plate, as the substrate 12.
  • the optical characteristics of the substrate 12 are not particularly limited, and may be a phase difference plate showing a phase difference or an optically isotropic substrate. That is, the substrate 12 does not have to be a retardation plate such as a ⁇ / 2 plate whose optical characteristics are strictly adjusted.
  • the in-plane retardation Re (1000) at a wavelength of 1000 nm of the substrate 12 may be made of a polymer film or the like having a variation of 20 nm or more. Furthermore, it may be made of a polymer film or the like having a variation of Re (1000) of 100 nm or more.
  • the in-plane retardation of the substrate is not particularly limited. For example, a retardation plate having an in-plane retardation Re (1000) of a wavelength of 1000 nm of 800 to 13000 nm can be used. Examples of polymer films that can be used as the substrate will be described later.
  • the light reflecting layers 14a, 14b, 16a, and 16b are layers formed by fixing the cholesteric liquid crystal phase
  • the light reflecting layers 14a, 14b, 16a, and 16b exhibit light selective reflectivity that reflects light of a specific wavelength based on the helical pitch of the cholesteric liquid crystal phase.
  • the adjacent light reflective layer 14a and 14b, together with the spiral directions of the respective cholesteric liquid crystal phase are opposite to each other, the reflection center wavelength lambda 14 is the same.
  • the adjacent light reflective layer 16a and 16b, together with the spiral directions of the respective cholesteric liquid crystal phase are opposite to each other, the reflection center wavelength lambda 16 is the same.
  • the light reflecting layers 14a and 14b selectively reflect the left circularly polarized light and the right circularly polarized light having the predetermined wavelength ⁇ 14 , and the light reflecting layers 16a and 16b The left circularly polarized light and the right circularly polarized light having the wavelength ⁇ 16 are selectively reflected.
  • the infrared light reflection 10 shown in FIG. 1 is an infrared light reflection plate that reflects infrared light having a wavelength of 700 nm or more, that is, the center wavelength ⁇ 14 of selective reflection by the light reflection layers 14a and 14b, and the light reflection layer 16a. It is preferable that the center wavelength ⁇ 16 of selective reflection by 16b is also 700 nm or more. In one example, one of the reflection center wavelengths ⁇ 14 and ⁇ 16 is in the range of 900 to 1050 nm (preferably 800 to 1000 nm, more preferably 850 to 950 nm), and the other is 1050 to 1300 nm (preferably 1000 to 1200 nm, more preferably 1050 to 1150 nm).
  • the helical pitch of the cholesteric liquid crystal phase exhibiting the reflection center wavelength is generally about 500 to 1350 nm (preferably about 500 to 900 nm, more preferably about 550 to 800 nm).
  • the thickness of each light reflecting layer is about 1 ⁇ m to 8 ⁇ m (preferably about 3 to 8 ⁇ m). However, it is not limited to these ranges.
  • a light reflecting layer having a desired helical pitch can be formed by adjusting the type and concentration of materials (mainly liquid crystal material and chiral agent) used for forming the layer. Moreover, the thickness of a layer can be made into a desired range by adjusting the application quantity.
  • the adjacent light reflecting layers 14a and 14b have the spiral directions of the respective cholesteric liquid crystal phases opposite to each other, and similarly, the adjacent light reflecting layers 16a and 16b have the spiral directions of the respective cholesteric liquid crystal phases.
  • the opposite is true.
  • it is possible to reflect both the left circularly polarized light and the right circularly polarized light having the same wavelength by arranging adjacent light reflecting layers made of cholesteric liquid crystal phases in the opposite directions and having the same selective reflection center wavelength. it can. This action is irrelevant to the optical characteristics of the substrate 12 and is obtained without being affected by the optical characteristics of the substrate 12.
  • a method comprising forming a layer composed of a desired cholesteric liquid crystal phase on separate temporary supports, and laminating and laminating these layers; or a cholesteric suitable as each light reflecting layer in a liquid crystal composition
  • a material capable of forming a liquid crystal phase is mixed, and the composition is applied to the surface of a support to form a film, followed by phase separation during drying and thermal alignment to form a two-layer cholesteric liquid crystal layer
  • the method of doing; etc. are known.
  • the former method using the lamination process is expensive, and the latter method using the phase separation increases the film thickness as a whole, deteriorates the orientation state, and causes fluctuations in the interface of the phase separation.
  • the orientation state deteriorates as well.
  • a laminated structure of the light reflecting layer is obtained by repeating the coating, it is preferable because a costly process such as laminating is unnecessary and a process that is difficult to control such as phase separation is not necessary.
  • the refractive index anisotropy [Delta] n 14a of the light reflecting layer 14a, and the refractive index anisotropy [Delta] n 14b of the light reflecting layer 14b is to satisfy the [Delta] n 14b ⁇ [Delta] n 14a, and refraction of the light reflecting layer 16a
  • the index anisotropy ⁇ n 16a and the refractive index anisotropy ⁇ n 16b of the light reflecting layer 16b satisfy ⁇ n 16b ⁇ n 16a .
  • a liquid crystal composition is applied to the surface of each of the light reflecting layers 14a and 16a to form a cholesteric liquid crystal phase, and the state is fixed to form the light reflecting layers 14b and 16b, respectively.
  • the alignment state of the light reflecting layers 14b and 16b is good and exhibits desired light reflecting characteristics.
  • the value is close to ⁇ n indicated by the rod-shaped liquid crystal. Therefore, if a light reflecting layer is formed using a liquid crystal composition containing a rod-like liquid crystal having a higher ⁇ n as a main raw material, ⁇ n of the light reflecting layer is naturally increased. On the other hand, when the concentration of the chiral agent added to obtain a desired helical pitch is high, the compounding ratio of the rod-like liquid crystal is relatively lowered, so that ⁇ n as a composition becomes small. Therefore, if a lower light reflection layer is formed using a liquid crystal composition that originally contains a rod-like liquid crystal having a high ⁇ n and a small amount of additive such as a chiral agent, ⁇ n of the lower light reflection layer is increased. .
  • a liquid crystal with a high ⁇ n is in the desired cholesteric liquid crystal phase state even without the addition of an additive such as a chiral agent, so there is no disorder of the interface or disorder due to the presence of the additive, etc., and a lower layer is formed. it can.
  • the liquid crystal composition for the upper layer can be applied to the surface of the lower layer in which the alignment state is good and is not disturbed, the desired cholesteric liquid crystal phase can be formed more stably, and the upper layer satisfying the desired characteristics can be formed. This is presumably due to the ability to form a light reflecting layer.
  • the light reflection layer 14a is made of a liquid crystal composition containing a right-turning chiral agent, that is, selectively reflects right-circularly polarized light
  • the light reflection layer 14b contains a left-turning chiral agent.
  • the left circularly polarized light is selectively reflected
  • the light reflecting layer 16a is formed of a liquid crystal composition containing a right-turning chiral agent, that is, the right circularly polarized light is selectively reflected, and the light reflecting layer.
  • 16b is made of a liquid crystal composition containing a left-turning chiral agent, that is, selectively reflects left circularly polarized light.
  • FIG. 2 sectional drawing of the infrared-light reflecting plate of other embodiment of this invention is shown.
  • the infrared light reflecting plate 10 ′ shown in FIG. 2 is the same as the infrared light reflecting plate 10 in FIG. 1, the light reflecting layers 14a and 14b on one surface of the substrate 12, and the light reflecting layer on the other surface. 16a and 16b. These characteristics and the relationship between them are the same as those of the infrared light reflection plate 10.
  • the infrared light reflection plate 10 ′ further includes light reflection layers 18a and 18b on the surface of the light reflection layer 14b, and light reflection layers 20a and 20b on the surface of the light reflection layer 16b.
  • the light reflecting layers 18a and 18b and the light reflecting layers 20a and 20b have the cholesteric liquid crystal phases in the spiral directions opposite to each other, and The reflection center wavelength is the same.
  • the reflection center wavelength lambda 18 of the light reflecting layer 18a and 18b, reflection center wavelength lambda 20 of the light reflecting layers 20a and 20b, together are different from each other, they are reflected in the light reflection layer 14a and 14b the central wavelength lambda 14 and the reflection center wavelength ⁇ 16 of the light reflecting layers 16a and 16b are not equal.
  • the infrared light reflection plate 10 ′ like the infrared light reflection plate 10, has selective reflection characteristics for the left circularly polarized light and the right circularly polarized light having the reflection center wavelength ⁇ 14 by the light reflective layers 14a and 14b, and the light reflective layer together show selective reflection characteristics with respect to left circularly polarized light and right circularly polarized light of the reflected center wavelength lambda 16 by 16a and 16b, the selective reflection characteristics with respect to left circularly polarized light and right circularly polarized light reflected by the light reflecting layer 18a and 18b center wavelength lambda 18,
  • selective reflection characteristics for the left circularly polarized light and the right circularly polarized light having the reflection center wavelength ⁇ 20 by the light reflection layers 20a and 20b are shown, and the wavelength band of selective reflection is made wider.
  • any of the reflection center wavelengths ⁇ 14 , ⁇ 16 , ⁇ 18, and ⁇ 20 is in the range of 800 to 1000 nm (more preferably, 850 to 950 nm), and any of 900 to 1100 nm (more preferably, 950). Is in the range of 1000 to 1200 nm (more preferably, 1050 to 1150 nm), and one is in the range of 1100 to 1300 nm (preferably, 1150 to 1250 nm). However, it is not limited to this example.
  • the group of the light reflecting layers 14a and 14b arranged on the same surface is compared with the group of the light reflecting layers 18a and 18b, the group of the light reflecting layers closer to the substrate, that is, the light reflecting layer 14a and The reflection center wavelength ⁇ 14 of the set 14b is preferably shorter than the reflection center wavelength ⁇ 18 of the set of the light reflection layers 18a and 18b, and similarly, the light reflection layer 16a disposed on the same surface. 16b and the set of the light reflecting layers 20a and 20b are compared, the reflection center wavelength ⁇ 16 of the set of the light reflecting layers closer to the substrate, that is, the set of the light reflecting layers 16a and 16b is the light reflecting layer 20a.
  • the reflection characteristics for the short wavelength light are improved.
  • the effect as a structural member will be kept good. That is, ⁇ 14 , ⁇ 16 , ⁇ 18 and ⁇ 20 are not equal to each other, and it is preferable that ⁇ 14 ⁇ 18 and ⁇ 16 ⁇ 20 are satisfied.
  • the formation method of the light reflection layers 18a, 18b, 20a, and 20b there is no restriction
  • a simpler method as described above, there is a method in which a liquid crystal composition is applied to the surface of the lower layer to form a cholesteric liquid crystal phase, and then the alignment state is fixed.
  • the surface properties and orientation state of the lower layer affect the orientation state and the like of the layer formed thereon. Therefore, in the case of manufacturing by this method, the refractive index of the light reflecting layer 18a is different.
  • the refractive index anisotropy [Delta] n 18b of the light reflecting layer 18b is to satisfy the [Delta] n 18b ⁇ [Delta] n 18a, and the refractive index anisotropy [Delta] n 20a of the light reflecting layer 20a, and refraction of the light reflecting layer 20b
  • the rate anisotropy ⁇ n 20b preferably satisfies ⁇ n 20b ⁇ n 20a .
  • the mode of the infrared light reflector of the present invention is not limited to the mode shown in FIGS. It is also possible to have a configuration in which light reflecting layers are laminated such as 3 sets (total 6 layers), 4 sets (total 8 layers) or more on both surfaces of the substrate. Further, the number of light reflecting layers may be different on one surface of the substrate and the other surface. Moreover, the aspect which has 2 or more sets of light reflection layers which show the same reflection center wavelength may be sufficient.
  • the infrared light reflector of the present invention may of course be used in combination with other infrared light reflectors for the purpose of broadening the reflection wavelength. Moreover, you may have the light reflection layer which reflects the light of a predetermined wavelength by principles other than the selective reflection characteristic of a cholesteric liquid crystal phase. Examples of members that can be combined include the composite film described in JP-A-4-504555 and the layers constituting the composite film, and the multilayer laminate described in JP-A-2008-545556.
  • the infrared light reflection plate of the present invention may have an easy-adhesion layer as the outermost layer in order to make it easy to adhere to other members.
  • the easy adhesion layer contains polyvinyl butyral resin as a main component
  • the thermal adhesiveness with the interlayer film of the laminated glass is improved, and the infrared light reflector of the present invention can be easily sandwiched in the laminated glass. it can.
  • the adhesion between the easy-adhesion layer and the intermediate film is high, the light resistance is excellent, and even when exposed to natural light for a long time, there is no deterioration due to generation of bubbles and the like, which is preferable.
  • It is preferable to add an ultraviolet absorber to the easy-adhesion layer because the light resistance is further improved and yellowing of the light reflecting layer due to long-term natural light irradiation can be suppressed.
  • the infrared light reflecting plate of the present invention it is preferable to use a curable liquid crystal composition for forming each light reflecting layer.
  • the liquid crystal composition contains at least a rod-like liquid crystal compound, an optically active compound (chiral agent), and a polymerization initiator. Two or more of each component may be included.
  • a polymerizable liquid crystal compound and a non-polymerizable liquid crystal compound can be used in combination. Also, a combination of a low-molecular liquid crystal compound and a high-molecular liquid crystal compound is possible.
  • it contains at least one selected from various additives such as a horizontal alignment agent, a non-uniformity inhibitor, a repellency inhibitor, and a polymerizable monomer. May be.
  • a polymerization inhibitor, an antioxidant, an ultraviolet absorber, a light stabilizer, and the like can be further added to the liquid crystal composition as necessary so long as the optical performance is not deteriorated.
  • Rod-like liquid crystal compound An example of the rod-like liquid crystal compound that can be used in the present invention is a rod-like nematic liquid crystal compound.
  • the rod-like nematic liquid crystal compound include azomethines, azoxys, cyanobiphenyls, cyanophenyl esters, benzoic acid esters, cyclohexanecarboxylic acid phenyl esters, cyanophenylcyclohexanes, cyano-substituted phenylpyrimidines, alkoxy-substituted Phenylpyrimidines, phenyldioxanes, tolanes and alkenylcyclohexylbenzonitriles are preferably used. Not only low-molecular liquid crystal compounds but also high-molecular liquid crystal compounds can be used.
  • the rod-like liquid crystal compound used in the present invention may be polymerizable or non-polymerizable.
  • the rod-like liquid crystal compound having no polymerizable group is described in various documents (for example, Y. Goto et.al., Mol. Cryst. Liq. Cryst. 1995, Vol. 260, pp. 23-28).
  • the polymerizable rod-like liquid crystal compound can be obtained by introducing a polymerizable group into the rod-like liquid crystal compound.
  • the polymerizable group include an unsaturated polymerizable group, an epoxy group, and an aziridinyl group, preferably an unsaturated polymerizable group, and particularly preferably an ethylenically unsaturated polymerizable group.
  • the polymerizable group can be introduced into the molecule of the rod-like liquid crystal compound by various methods.
  • the number of polymerizable groups possessed by the polymerizable rod-like liquid crystal compound is preferably 1 to 6, more preferably 1 to 3.
  • Examples of the polymerizable rod-like liquid crystal compound are described in Makromol. Chem. 190, 2255 (1989), Advanced Materials 5, 107 (1993), US Pat. Nos. 4,683,327, 5,622,648, and 5,770,107, International Publication WO95 / 22586. No. 95/24455, No. 97/00600, No. 98/23580, No. 98/52905, JP-A-1-272551, JP-A-6-16616, and JP-A-7-110469.
  • Two or more kinds of polymerizable rod-like liquid crystal compounds may be used in combination.
  • the alignment temperature can be lowered.
  • the liquid crystal composition exhibits a cholesteric liquid crystal phase, and for that purpose, it preferably contains an optically active compound.
  • the rod-like liquid crystal compound is a molecule having an illegitimate carbon atom
  • a cholesteric liquid crystal phase may be stably formed without adding an optically active compound.
  • the optically active compound includes various known chiral agents (for example, Liquid Crystal Device Handbook, Chapter 3-4-3, TN, chiral agent for STN, 199 pages, edited by Japan Society for the Promotion of Science, 142nd Committee, 1989). ) Can be selected.
  • the optically active compound generally contains an asymmetric carbon atom, but an axially asymmetric compound or a planar asymmetric compound that does not contain an asymmetric carbon atom can also be used as a chiral agent.
  • the axial asymmetric compound or the planar asymmetric compound include binaphthyl, helicene, paracyclophane, and derivatives thereof.
  • the optically active compound (chiral agent) may have a polymerizable group.
  • the optically active compound has a polymerizable group and the rod-like liquid crystal compound used in combination also has a polymerizable group, it is derived from the rod-like liquid crystal compound by a polymerization reaction of the polymerizable optically active compound and the polymerizable rod-like liquid crystal compound.
  • a polymer having a repeating unit and a repeating unit derived from an optically active compound can be formed.
  • the polymerizable group possessed by the polymerizable optically active compound is preferably the same group as the polymerizable group possessed by the polymerizable rod-like liquid crystal compound.
  • the polymerizable group of the optically active compound is also preferably an unsaturated polymerizable group, an epoxy group or an aziridinyl group, more preferably an unsaturated polymerizable group, and an ethylenically unsaturated polymerizable group.
  • the optically active compound may be a liquid crystal compound.
  • the optically active compound in the liquid crystal composition is preferably 1 to 30 mol% with respect to the liquid crystal compound used in combination. A smaller amount of the optically active compound is preferred because it often does not affect liquid crystallinity. Therefore, the optically active compound used as the chiral agent is preferably a compound having a strong twisting power so that a twisted orientation with a desired helical pitch can be achieved even with a small amount. Examples of such a chiral agent exhibiting a strong twisting force include those described in JP-A-2003-287623, which can be preferably used in the present invention.
  • the infrared light reflecting plate of the present invention has a structure in which light reflecting layers whose spiral directions of cholesteric liquid crystal phases are opposite to each other are adjacent to each other.
  • the pair of adjacent light reflecting layers is characterized in that the refractive index anisotropy of the lower light reflecting layer is larger than the refractive index anisotropy of the upper light reflecting layer.
  • the refractive index anisotropy of the layer is affected by the refractive index anisotropy of the liquid crystal material used as the main raw material, the amount of added chiral agent, and the like.
  • a right-turning chiral agent a strong twisting power is provided to the market more than a left-turning chiral agent.
  • the amount of right-turning chiral agent added can be made smaller than the amount of left-turning chiral agent added.
  • the refractive index anisotropy ⁇ n can be lowered. Therefore, as the liquid crystal composition for forming the lower light reflecting layer, a composition containing a right-turning chiral agent is used, and as the liquid crystal composition for forming the information light reflecting layer, the left-turning property is used.
  • An embodiment using a composition containing a chiral agent is preferable because of a wide selection of materials.
  • the liquid crystal composition used for forming the light reflecting layer is preferably a polymerizable liquid crystal composition, and for that purpose, it preferably contains a polymerization initiator.
  • the polymerization initiator to be used is preferably a photopolymerization initiator capable of starting the polymerization reaction by irradiation with ultraviolet rays.
  • photopolymerization initiators include ⁇ -carbonyl compounds (described in US Pat. Nos. 2,367,661 and 2,367,670), acyloin ether (described in US Pat. No. 2,448,828), ⁇ -hydrocarbon substituted aromatics.
  • the amount of the photopolymerization initiator used is preferably 0.1 to 20% by mass, more preferably 1 to 8% by mass of the liquid crystal composition (solid content in the case of a coating liquid).
  • Alignment control agent An alignment control agent that contributes to stable or rapid cholesteric liquid crystal phase may be added to the liquid crystal composition.
  • the alignment control agent include fluorine-containing (meth) acrylate-based polymers and compounds represented by the following general formulas (X1) to (X3). You may contain 2 or more types selected from these. These compounds can reduce the tilt angle of the molecules of the liquid crystal compound or can be substantially horizontally aligned at the air interface of the layer.
  • horizontal alignment means that the major axis of the liquid crystal molecule is parallel to the film surface, but it is not required to be strictly parallel. An orientation with an inclination angle of less than 20 degrees is meant.
  • R 1 , R 2 and R 3 each independently represent a hydrogen atom or a substituent
  • X 1 , X 2 and X 3 each represent a single bond or a divalent linking group.
  • the substituents represented by R 1 to R 3 are each preferably a substituted or unsubstituted alkyl group (more preferably an unsubstituted alkyl group or a fluorine-substituted alkyl group), an aryl group (particularly a fluorine-substituted alkyl group).
  • An aryl group having a group is preferred), a substituted or unsubstituted amino group, an alkoxy group, an alkylthio group, and a halogen atom.
  • the divalent linking groups represented by X 1 , X 2 and X 3 are each an alkylene group, an alkenylene group, a divalent aromatic group, a divalent heterocyclic residue, —CO—, —NRa— (Ra Is a divalent linking group selected from the group consisting of —O—, —S—, —SO—, —SO 2 —, and combinations thereof. Is preferred.
  • the divalent linking group is selected from the group consisting of an alkylene group, a phenylene group, —CO—, —NRa—, —O—, —S— and —SO 2 — or selected from the group. It is more preferably a divalent linking group in which at least two groups are combined.
  • the number of carbon atoms of the alkylene group is preferably 1-12.
  • the alkenylene group preferably has 2 to 12 carbon atoms.
  • the number of carbon atoms of the divalent aromatic group is preferably 6-10.
  • R represents a substituent
  • m represents an integer of 0 to 5.
  • Preferred substituents for R are the same as those mentioned as preferred ranges for the substituents represented by R 1 , R 2 , and R 3 .
  • m preferably represents an integer of 1 to 3, particularly preferably 2 or 3.
  • R 4 , R 5 , R 6 , R 7 , R 8 and R 9 each independently represent a hydrogen atom or a substituent.
  • the substituents represented by R 4 , R 5 , R 6 , R 7 , R 8 and R 9 are preferably the substituents represented by R 1 , R 2 and R 3 in the general formula (XI). It is the same as that mentioned as a thing.
  • Examples of the compounds represented by the formulas (X1) to (X3) that can be used as the alignment control agent in the present invention include compounds described in JP-A-2005-99248.
  • the alignment control agent one type of the compounds represented by the general formulas (X1) to (X3) may be used alone, or two or more types may be used in combination.
  • the amount of the compound represented by any one of the general formulas (X1) to (X3) in the liquid crystal composition is preferably 0.01 to 10% by mass, and 0.01 to 5% by mass of the liquid crystal compound. % Is more preferable, and 0.02 to 1% by mass is particularly preferable.
  • the infrared light reflection plate of the present invention has a substrate, but the substrate is self-supporting, and there is no limitation on the material and optical characteristics as long as it supports the light reflection layer. Depending on the application, high transparency to ultraviolet light will be required. It is not necessary to use a retardation plate such as a ⁇ / 2 plate manufactured by managing the production process so as to satisfy a predetermined optical characteristic. Can be used. If this is expressed by the variation of the in-plane retardation Re (1000) at a wavelength of 1000 nm, the variation of Re (1000) may be 20 nm or more, or may be 100 nm or more.
  • the in-plane retardation of the substrate is not particularly limited. For example, a retardation plate having an in-plane retardation Re (1000) of a wavelength of 1000 nm of 800 to 13000 nm can be used.
  • polymer films having high transparency to visible light examples include polymer films for various optical films used as members of display devices such as liquid crystal display devices.
  • the substrate examples include polyester films such as polyethylene terephthalate (PET), polybutylene terephthalate, and polyethylene naphthalate (PEN); polycarbonate (PC) films and polymethyl methacrylate films; polyolefin films such as polyethylene and polypropylene; polyimide films, An acetyl cellulose (TAC) film etc. are mentioned.
  • the infrared light reflecting plate of the present invention is preferably produced by a coating method.
  • An example of a manufacturing method is (1) Applying a curable liquid crystal composition to the surface of a substrate or the like to make a cholesteric liquid crystal phase; (2) irradiating the curable liquid crystal composition with ultraviolet rays to advance a curing reaction, fixing a cholesteric liquid crystal phase, and forming a light reflection layer; Is a production method comprising at least By repeating the steps of (1) and (2) twice on one surface of the substrate and twice on the other surface of the substrate; or by simultaneously repeating twice on both surfaces of the substrate, An infrared light reflector having the same configuration as that shown in FIG. 1 can be manufactured. Also, repeat steps (1) and (2) 4 times on one surface of the substrate and 4 times on the other surface of the substrate; or 4 times simultaneously on both surfaces of the substrate. Thus, an infrared light reflector having the same configuration as that shown in FIG. 2 can be produced.
  • the curable liquid crystal composition is applied to the surface of the substrate or the lower light reflection layer.
  • the curable liquid crystal composition is preferably prepared as a coating solution in which a material is dissolved and / or dispersed in a solvent.
  • the coating liquid can be applied by various methods such as a wire bar coating method, an extrusion coating method, a direct gravure coating method, a reverse gravure coating method, and a die coating method.
  • a liquid crystal composition can be discharged from a nozzle using an ink jet apparatus to form a coating film.
  • the curable liquid crystal composition applied to the surface to become a coating film is brought into a cholesteric liquid crystal phase.
  • the coating film may be dried and the solvent may be removed to obtain a cholesteric liquid crystal phase.
  • the cholesteric liquid crystal phase can be stably formed by heating to the temperature of the isotropic phase and then cooling to the cholesteric liquid crystal phase transition temperature.
  • the liquid crystal phase transition temperature of the curable liquid crystal composition is preferably in the range of 10 to 250 ° C., more preferably in the range of 10 to 150 ° C. from the viewpoint of production suitability and the like.
  • a cooling step or the like may be required to lower the temperature to a temperature range exhibiting a liquid crystal phase.
  • a high temperature is required to make the isotropic liquid state higher than the temperature range once exhibiting the liquid crystal phase, which is disadvantageous from waste of thermal energy, deformation of the substrate, and alteration.
  • the coating film in the cholesteric liquid crystal phase is irradiated with ultraviolet rays to advance the curing reaction.
  • a light source such as an ultraviolet lamp is used.
  • the curing reaction of the liquid crystal composition proceeds, the cholesteric liquid crystal phase is fixed, and a light reflecting layer is formed.
  • the amount of irradiation energy of ultraviolet rays is not particularly limited, but is generally preferably about 100 mJ / cm 2 to 800 mJ / cm 2 .
  • ultraviolet irradiation may be performed under heating conditions. Moreover, it is preferable to maintain the temperature at the time of ultraviolet irradiation in the temperature range which exhibits a cholesteric liquid crystal phase so that a cholesteric liquid crystal phase may not be disturbed. Also, since the oxygen concentration in the atmosphere is related to the degree of polymerization, if the desired degree of polymerization is not reached in the air and the film strength is insufficient, the oxygen concentration in the atmosphere is reduced by a method such as nitrogen substitution. It is preferable. A preferable oxygen concentration is preferably 10% or less, more preferably 7% or less, and most preferably 3% or less.
  • the reaction rate of the curing reaction (for example, polymerization reaction) that proceeds by irradiation with ultraviolet rays is 70% or more from the viewpoint of maintaining the mechanical strength of the layer and suppressing unreacted substances from flowing out of the layer. Preferably, it is 80% or more, more preferably 90% or more.
  • a method of increasing the irradiation amount of ultraviolet rays to be irradiated and polymerization under a nitrogen atmosphere or heating conditions are effective.
  • a method of further promoting the reaction by a thermal polymerization reaction by maintaining the polymer at a temperature higher than the polymerization temperature, or a method of irradiating ultraviolet rays again (however, irradiation is performed under conditions satisfying the conditions of the present invention).
  • the reaction rate can be measured by comparing the absorption intensity of the infrared vibration spectrum of a reactive group (for example, a polymerizable group) before and after the reaction proceeds.
  • the cholesteric liquid crystal phase is fixed and the light reflecting layer is formed.
  • the state in which the liquid crystal phase is “fixed” is the most typical and preferred mode in which the orientation of the liquid crystal compound in the cholesteric liquid crystal phase is maintained.
  • the layer has no fluidity and is oriented by an external field or external force. It shall mean a state in which the fixed orientation form can be kept stable without causing a change in form.
  • the alignment state of the cholesteric liquid crystal phase is fixed by a curing reaction that proceeds by ultraviolet irradiation.
  • the liquid crystal composition may have a high molecular weight due to a curing reaction and may no longer have liquid crystallinity.
  • the infrared light reflection plate of the present invention may have an easy-adhesion layer containing a polyvinyl butyral resin as at least one outermost layer.
  • Laminated glass is generally produced by thermally bonding an intermediate film formed on the inner surfaces of two glass plates.
  • the surface of the light reflecting layer is thermally bonded to the intermediate film.
  • these adhesion forces are insufficient, when exposed to natural light for a long time and the temperature rises, bubbles are generated between the light reflecting layer and the intermediate film, and the transparency is lowered.
  • the surface of the easy-adhesion layer only needs to be thermally bonded to the intermediate film when sandwiched in the glass plate, thereby improving adhesion. As a result, the light resistance is improved.
  • the polyvinyl butyral resin is a kind of polyvinyl acetal produced by reacting polyvinyl alcohol and butyraldehyde with an acid catalyst, and is a resin having a repeating unit having the following structure.
  • the easy adhesion layer is formed by coating.
  • it may be formed by coating on the surface of a light reflecting layer formed by fixing a cholesteric liquid crystal phase. More specifically, one type of polyvinyl butyral resin is dissolved in an organic solvent to prepare a coating solution, the coating solution is applied to the surface of a light reflection layer, etc., and heated and dried as desired.
  • An adhesive layer can be formed.
  • a solvent used for preparing the coating solution for example, methoxypropyl acetate (PGMEA), methyl ethyl ketone (MEK), isopropanol (IPA) and the like can be used.
  • a solvent used for preparing the coating solution for example, methoxypropyl acetate (PGMEA), methyl ethyl ketone (MEK), isopropanol (IPA) and the like can be used.
  • Various conventionally known methods can be used as the coating method.
  • the preferred temperature for drying varies depending on the material used for the preparation
  • an ultraviolet absorber to the easy-adhesion layer.
  • usable ultraviolet absorbers include benzotriazole-based, benzodithiol-based, coumarin-based, benzophenone-based, salicylic acid ester-based, and cyanoacrylate-based ultraviolet absorbers; titanium oxide, zinc oxide, and the like.
  • particularly preferable ultraviolet absorbers include Tinuvin 326, 328, 479 (all manufactured by Ciba Japan).
  • the type and blending amount of the ultraviolet absorber are not particularly limited and may be appropriately selected depending on the intended purpose.
  • the easy-adhesion layer makes the transmittance of ultraviolet rays having a wavelength of 380 nm or less 0.1% or less. An action is preferable because yellowing due to ultraviolet rays can be remarkably reduced. Therefore, it is preferable to determine the type and blending amount of the ultraviolet absorber so as to satisfy this characteristic.
  • the present invention relates to an infrared light reflective laminated glass using the infrared light reflection plate of the present invention, specifically, an infrared light having two glass plates and the infrared light reflection plate of the present invention in between. It relates to light reflective glass. It is preferable to use the infrared light reflector of the present invention having an easy-adhesion film as the outermost layer.
  • the two glass plates used for the production of laminated glass are each a glass plate for laminated glass having an intermediate film on the surface, and general ones can be used.
  • the intermediate film generally contains a polyvinyl butyral resin (PVB) or an ethylene / vinyl acetate copolymer (EVA) as a main raw material.
  • PVB polyvinyl butyral resin
  • EVA ethylene / vinyl acetate copolymer
  • the easy-adhesion layer has good adhesion to an intermediate film made of any material as a main raw material. In particular, it is excellent in thermal adhesiveness with an intermediate film made mainly of polyvinyl butyral resin.
  • a preferable range changes according to a use. For example, it is generally preferable to use a glass plate having a thickness of 2.0 to 2.3 mm in the application of a windshield (window shield) of a transportation vehicle.
  • the thickness of the intermediate film is generally about 380 to 760 ⁇ m.
  • infrared light reflecting plate and infrared light reflecting laminated glass are selected to have a reflection peak at a wavelength of 700 nm or more (more preferably from 800 to 1300 nm). Reflective properties are shown.
  • the reflection plate having such characteristics is attached to a building such as a house, an office building, or a window of a vehicle such as an automobile as a member for heat insulation of solar radiation.
  • the infrared-light reflecting plate of this invention can be used for the use as a member for heat insulation of solar radiation itself (for example, glass for heat insulation, a film for heat insulation).
  • the infrared light reflecting plate and infrared light reflecting laminated glass of the present invention can reflect a maximum reflectance of 90% or more at a wavelength of 800 to 1300 nm, and of course, a maximum reflectance of 100% is most preferable.
  • Other important performances as an infrared light reflecting plate and an infrared light reflecting laminated glass are transmittance of visible light and haze. By adjusting the selection of materials and manufacturing conditions, etc., an infrared light reflecting plate exhibiting preferable visible light transmittance and haze can be provided according to applications.
  • an infrared light reflecting plate and an infrared light reflecting property in which the visible light transmittance is 90% or more and the infrared reflectance satisfies the above range Laminated glass can be used.
  • each of the prepared coating solutions was applied at room temperature on a PET film manufactured by Fuji Film Co., Ltd. using a wire bar so that the dry film thickness after drying was 6 ⁇ m.
  • the variation in Re (1000) of this PET film is shown in the table below.
  • Infrared light reflectors shown in the following table were prepared by the above method. Each of the produced reflectors was evaluated by measuring the maximum reflectance of solar radiation at 800 to 1300 nm using a spectrophotometer.
  • the PET film used as the substrate had a Re of about 4000 to 5000 nm.
  • the PET film used in Comparative Example 3 had a Re of 4050 nm.
  • Re variation of the substrate means variation of in-plane retardation Re (1000) having a wavelength of 1000 nm.
  • the measurement of Re of a film having a large Re is obtained by the following method because it is difficult to obtain an accurate value with a general phase difference measuring apparatus. The measurement is performed using a polarizing microscope and a spectrum meter attached thereto.
  • an interference filter with a known transmission center wavelength ⁇ is inserted into the optical path of a polarizing microscope, and the order (Re / ⁇ ) of the front Re of the sample at the wavelength ⁇ is grasped by observing the conoscopic image of the sample.
  • Front Re means Re measured by making incident light incident on the sample film from the normal direction.
  • the film is biaxial, an image with an order of 0 is seen, and the order of Re is determined from the number of interference fringes from that point to the vertical incidence position of the image. If the film is uniaxial or the orientation of order 0 is not visible, Re is a known retardation film and its slow axis is the sample until the vertical incident position of the image is near the 0th order interference color.
  • the order of Re is determined by overlapping the sample so as to be orthogonal to the slow axis.
  • the polarization microscope of the sample is measured at a diagonal position with the polarizing microscope in an orthoscope state.
  • the transmittance gives a minimum value when the order is an integer including 0, and gives a maximum value when (2n + 1) / 2 (n is an integer including 0). Therefore, the transmission filter transmission center obtained by the above method is used.
  • Re can be determined at the wavelength with the maximum and minimum transmittance. This is approximated to a quartic curve with respect to the wavelength and extrapolated to obtain Re at 1000 nm.

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Abstract

L'invention concerne une plaque réfléchissant le rayonnement infrarouge qui présente une caractéristique de réflexion sélective améliorée. La plaque réfléchissant le rayonnement infrarouge comprend un substrat dont la variation de Re (1000) est égale ou supérieure à 20 nm, au moins deux couches réfléchissantes (X1, X2) prévues sur une surface du substrat et qui contiennent une première phase de cristaux liquides cholestériques fixée, et au moins deux couches réfléchissantes (Y1, Y2) prévues sur l'autre surface du substrat et qui contiennent une phase de cristaux liquides cholestériques fixée. La longueur d'onde centrale de réflexion des couches réfléchissantes (X1, X2) est représentée par λX1 (nm), les couches réfléchissantes réfléchissant les faisceaux lumineux polarisés de manière circulaire dont les directions de polarisation sont opposées et qui sont mutuellement égaux ; la longueur d'onde centrale de réflexion des couches réfléchissantes (Y1, Y2) est représentée par λY1 (nm), les couches réfléchissantes (Y1, Y2) réfléchissant les faisceaux lumineux polarisés de manière circulaire dont les directions de polarisation sont opposées et qui sont mutuellement égaux ; λX1 et λY1 ne sont pas égaux, les anisotropies respectives des indices de réfraction ΔnX1 et ΔnX2 de la couche réfléchissante (X1) (couche inférieure) et de la couche réfléchissante (X2) (couche supérieure) satisfont la relation ΔnX2 < ΔnX1, et les anisotropies respectives des indices de réfraction ΔnY1, ΔnY2 de la couche réfléchissante (Y1) (couche inférieure) et de la couche réfléchissante (Y2) (couche supérieure) satisfont la relation ΔnY2 < ΔnY1.
PCT/JP2010/059830 2009-06-11 2010-06-10 Plaque réfléchissant le rayonnement infrarouge et feuille de verre liée réfléchissant le rayonnement infrarouge Ceased WO2010143683A1 (fr)

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US13/377,571 US20120086904A1 (en) 2009-06-11 2010-06-10 Infrared-light reflective plate and infrared-light reflective laminated glass
CN201080025374.9A CN102804003B (zh) 2009-06-11 2010-06-10 红外光反射板和红外光反射性夹层玻璃
EP10786214A EP2442161A4 (fr) 2009-06-11 2010-06-10 Plaque réfléchissant le rayonnement infrarouge et feuille de verre liée réfléchissant le rayonnement infrarouge

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WO2013047142A1 (fr) * 2011-09-27 2013-04-04 富士フイルム株式会社 Couche réfléchissant l'infrarouge, plaque réfléchissant l'infrarouge, feuille intercouche pour feuilletage de verre, verre feuilleté et procédés de production pour celui-ci
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WO2012066841A1 (fr) * 2010-11-15 2012-05-24 富士フイルム株式会社 Matériau d'arrêt de la chaleur
WO2012111715A1 (fr) * 2011-02-18 2012-08-23 富士フイルム株式会社 Plaque de réflexion infrarouge, feuille inter-couche pour verre feuilleté, verre feuilleté et procédé de production
JP2012173421A (ja) * 2011-02-18 2012-09-10 Fujifilm Corp 赤外光反射板並びに合わせガラス用積層中間膜シート及び合わせガラスとそれらの製造方法
EP2677352A4 (fr) * 2011-02-18 2014-08-27 Fujifilm Corp Plaque de réflexion infrarouge, feuille inter-couche pour verre feuilleté, verre feuilleté et procédé de production
WO2013047142A1 (fr) * 2011-09-27 2013-04-04 富士フイルム株式会社 Couche réfléchissant l'infrarouge, plaque réfléchissant l'infrarouge, feuille intercouche pour feuilletage de verre, verre feuilleté et procédés de production pour celui-ci
JP2013195630A (ja) * 2012-03-19 2013-09-30 Fujifilm Corp 光反射フィルム、自動車用フロントガラス、建材用ガラス
WO2022009784A1 (fr) 2020-07-10 2022-01-13 Ａｇｃ株式会社 Structure optique formée par combinaison d'un demi-miroir et d'un film de réflexion sélective

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US20120086904A1 (en) 2012-04-12
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